![]() ![]() Insulation is used to reduce the work and energy required to achieve and maintain a lower temperature in the cooled space. ![]() Work is applied to cool a living space or storage volume by pumping heat from a lower temperature heat source into a higher temperature heat sink. It is also applied to HVACR work, when describing the "process" of refrigerant flow through an HVACR unit, whether it is a packaged or split system. This satisfies the second law of thermodynamics.Ī heat pump describes the changes that take place in the refrigerant as it alternately absorbs and rejects heat as it circulates through a refrigerator. In the power cycle, heat is supplied from a high-temperature source to the heat engine, part of the heat being used to produce mechanical work and the rest being rejected to a low-temperature sink. The inverse of the heat pump cycle is the thermodynamic power cycle. Technically a refrigerator cycle is also a heat pump cycle.Ī heat pump is when heat is removed from a low-temperature space or source and rejected to a high-temperature sink with the help of external mechanical work. The difference between the two is that heat pumps are intended to keep a place warm and refrigerators designed to cool it. ![]() Thermodynamic heat pump and refrigeration cycles are the models for heat pumps and refrigerators. ![]()
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